Thermodynamics is one of the basic pillars of modern physics. Despite its great importance for our technological development, the the validity of very foundations of this theory was always a controversial issue. In 1871, with the intention to discuss the validity of the second law of thermodynamics, Maxwell introduced a character that since then permeates the physics. Maxwell’s demon was apparently able to violate the second law. There was several attempts of saving this law, but only with the recognition, due to Rolf Landauer, of the physical character of information, the demon was finally exorcized. This important result, today know as the Landauer principle, states that information cannot be erased without heat generation. Its importance goes beyond the physical science, playing an important role in biology, computer science and engineering. However, such principle was only recently experimentally verified for a classical system. Here we discuss the first experimental implementation of Landauer’s principle in the full quantum regime.